gh-149755: fix Modules/_decimal/tests/deccheck.py

This script was broken by 511ca94 and a07da09.

Author: skirpichev

Modules/_decimal/tests/deccheck.py

@@ -53,6 +53,8 @@
 from formathelper import rand_format, rand_locale
 from _pydecimal import _dec_from_triple
 
+sys.set_int_max_str_digits(0)
+
 C = import_fresh_module('decimal', fresh=['_decimal'])
 P = import_fresh_module('decimal', blocked=['_decimal'])
 EXIT_STATUS = 0
@@ -969,6 +971,8 @@ def test_unary(method, prec, exp_range, restricted_range, itr, stat):
         try:
             if not convert(t):
                 continue
+            if t.funcname == '__hash__' and t.cop[0].is_nan():
+                continue
             callfuncs(t)
             verify(t, stat)
         except VerifyError as err: